Clutch-operating mechanism for hoists



Jan. 29, 1929. 1,700,552

J. P. STREET CLUTCH OPERATING MECHANISM FOR HOISTS Filed O t. 4. 1926 s Sheets- Sheet 1 l 35 l 1 3L 3 Jan. 29, 1929. 1,700,552

, J. P. STREET I CLUTCH OPERATING- MECHANISM FOR HOISTS Filed 0 1 1926 5 Sheets-Sheet 2 Jan. 29, 1929. 1,700,552

J. P. STREET I CLUTCH OPERATING MECHANISM FOR HOISTS Fi1ed0ct.4. 1926 s Sheets-Sheet 5 Patented Jan. 29, 1929.

' U I ED; srAfr E's JOSEPH RsirEEEr; E EATTANO GA; TENNESSEE. i

CLUTCH-OPERATING EcH-AmsMmoE- HoIsrs.

AppIication fiIed October-4; 192s. 1 Seria1"No; 139',428:

This-inventionrelates to means -for-'operating: the friction bands on single and two'- speed'hoists' and constitutes more especially a means wherebyan exceedinglysensitive con trol of the mechanism can be effected.

With -the foregoing and other objects in view which will appear asv the description I proceeds,-the invention resides in the combinationand-arrangement of parts and inthe details of:construction hereinafterdescribedand claimed; itbeing understood that changes in the precise embodiment of the-invention herein disclosed may be made within the scope I of what is 'claimed, without departing from the spirit of the invention;

In said drawings, 7' F igure'l is a 'central longitudinal section through the parts constituting the present invention'." p a Figure 2 is a section' on line '22,Figure 1. Figure 3 isa section on line -3-3-, Figure :1.

Figure 4 is a section'similar toFigure '3 but showing'only part of-the'gear, the 'lever of the master clutch mechanismibe'ing shown in position on itsactuatingcam:

Figure 5'is a horizontal-section, thegear hub and the-ffriction drums being shown in plan. Figure 6 is a detail view of the'armof the master clutch mechanism;

' Referring to thefigures by, characters of. reference 1 designates the shaftof the hoistmechanism to whichis keyed'or otherwise se-- cured'the-lmainigear 2in which iszjournaled a shaft 3 having'means, not'shown, for operatingthe master clutch ofthe hoist so as to throw it on and off when said shaft is rotated back and forth. This master clutch and its operating mechanism in themselves constitute no part of the present invention and for this reason it is not deemed necessary to show or describe them in detail. A lever is fastened l to one end of shaft 3 and constitutes a means 45, for transmitting rocking motion thereto, this lever being provided at its free-endwith a roller 5. Shaft 1 is journaled in a, suitable bearing indicated generally at 6 and keyed or 'otherW iSe secured to the shaft adjacent this bearing is a sleeve 7 having an annular flange 8 in which are seated radial pins 9 constituting bearings for beveled pinions 10.

Mounted to rotate freely on the shaft 1 between sleeve 7 and the gear 2 is the hub 11 of a friction drum 12. One end of the hub 11 w carries a cam projection 13 for engagement In the accompanying drawings, the-preferred" form ofthe invention has been-shown."

between stop projections 15 and1-6 carried by the gear 2.

with-the roller 5 a am particularly in Figure and extendingglaterally from this cam pro ect1on 13 is a lug 14 designed to work Drum 12 has one facerecessed'as indicatedtodrum -12,-'

Mounted for rotation on" the; sleeve :7 be

at :17 andthe beveled pinionslO project into? thls-recess-and engage a beveled gear'18 which is located within the recess-Hand" is secured 6 tween the beari'ng 6 and the flange :8 is thehub the pinions -10. I

A holding arm-23 is fixedly con'nected'to the bearing 6 or-other suitable structure and:

extends across but out' of contact withatho:

drums 12 and 20 -Friction'bands24 and2-5 are:

extended between this arm 23 andrthe-respem tive drums, the--ba'nd24 being extended-around-- the 'drum "12' while the band 25 i's' extended and straddles the arm f 23', thereby-serving to therein and bearing against the arm -23 so that the. spring-serves -to hold the friction band meansofan;adjustingscrew283- f normally lifted' at its center away from the drum-with whichit cooperates. The tension of each-ofthe'springs' 27 can'be'varied by Extending from one end of each friction band 24 and 25 is a bracket 29 to which is pivy j otally connected .a lever 30'. A rod 31 is pivot-j around1the-=drum 2O.-' A yoke-26 is secured -f to the middle portion of each vof these bandshold the bands/against creeping around the r drumsor 'rotatingwith them.- Each'ofthese yokes 26 hasa compression spring 27 mounted ally connected to this lever and loosely* engages an ear 32 extending'from the other end of the friction band. A spring 33-is mounted ear'32 for the purpose of holding the free end i portions of the friction band normally pressed apart, it being understood that the outer end on the rodand thrusts constantly against the I 7 -.of lever 30 is anchored toanoperating rod or r v the likenot shown; By-means of a nut 34 which engages the threadedfend of rod 31, the relative positions of the lever 30fandcar 32 can be varied and the compression of spring 33 can be regulated. s s p In using this apparatus the gear 2 and the sleeve 7 both rotate withthe'shaft 1.1'As the the rotation-of the sleeve? and consequent drums 12 and 20 are normally unrestrained,

travel of the pinions 10 about the axis of the shaft 1 will result in both drums 12 and likewise rotating with the shaft so that there is no change in the relative positions of the cam 13 and lever 4t. By tightening the friction band 24 upon the drum 12 through the actuation of its lever 30, said drum 12 will be held stationary and as shaft 1 is still ro-- tating the roller 5 will travel onto the cam 13 to the position shown in Figure 4, thereby rotating shaft?) so as to apply the master clutch. v

To release the master'clutch or, in other .words, to allow the arm or lever 4: to swing inwardly to the'position shown in Figure 3, the band 25 is clamped upon the drum 20 While drum 12 is released.

7 to rotate within the hub 19 of drum 20 and the pinions 10 will be caused to travel along the stationary gear 22. Consequently motion will betransmitted through these pinions to the gear 18 and the drum 12, this drum being revolved at a greater speed than the gear 2 and thereby causing the cam 13 to work from under the roller 5 so that themaster clutch thus becomes released. This in ward movement of the arm or-jlever 4' can be assisted by the use of a spring 35. I

' As heretofore explained the operation of the'friction bands is'constantly under the controlof suitably located members connected to levers 30 by rods not shownf These menu tween the sleeve and gear, a lost motion'con- Thus the continued rotation of shaft 1 will cause sleeve .carried and a lever fixed to the rock shaft, of a' nection between said drum and the gear, a

drum mounted forrotation on the sleeve, a

gear carried by each drum concentric with the shaft, pinions meshing with said gears and supported by the sleeve between the drums, acam upon the first named drum, means for retarding the rotation of said drum during rotation of the gear to move the lever onto the cam to rotate the rock shaft, and means for holding the other drumagainst rotation thereby to actuate the gears to impart motion to the first named drum, thereby to shift the cam from engagement with the lever.

2. The combination with a main shaft, a

gear secured thereto, a sleeve spacedfrom the from the rock shaft, of a drum mounted for rotation on theshaft between the sleeve and.

gear and secured to the shaft, a rock shaft by the gear, and a lever extending gear, a cam carried by said'drum, a lost motion connection between the drum and gear, 7

said drum when in one extreme position relative to the gear being located with its cam away from the lever and, when inits other eX- treme position relative to the gear being located with its cam in engagement withthe lever, a second drum mountedifor rotation on the sleeve, gears concentric with the shaft f and carried by the respective drums, a plu-- rality of pinions mounted for rotation about axes radiating from the sleeve, said :pinions being carried by the sleeve and meshing with 7 both gears, means under the control of an operator for holding one of the drums against rotation to transmit motion through the gears and pinions to the other drum and bring the cam to one extreme position, and means for holding the other drum against rotation to transmit motion throughthe drum, gears and pinion to shift the cam to its other extreme position.

In testimony that I claim' the foregoing as.

hereto affixed my. signature. JOSEPH STREET.

my own, I have 

